Question 1

Which of the following best describes the Fluid Mosaic Model of the cell membrane?

Accepted Answer

A dynamic structure with proteins and lipids able to move laterally within the phospholipid bilayer.

Question 2

A neuron transmits an electrical signal by allowing sodium ions ($$\mathrm{Na^+}) to $$flow into the cell. Which membrane structure is primarily responsible for this process?

Accepted Answer

Integral protein channels

Question 3

Which of the following is an example of active transport across a cell membrane?

Accepted Answer

Pumping potassium ions ($$\mathrm{K^+}) $$into a neuron against their concentration gradient using ATP

Question 4

A scientist observes that a cell placed in a hypertonic solution shrinks. Which process is responsible for this observation?

Accepted Answer

Osmosis of water out of the cell

Question 5

Which organelle is directly involved in the synthesis of proteins that are exported from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 6

A mutation causes a cell to lack functional lysosomes. Which of the following would most likely result?

Accepted Answer

The cell would accumulate undigested macromolecules.

Question 7

Which of the following best explains why neurons have a high concentration of mitochondria?

Accepted Answer

Neurons require large amounts of energy for active transport of ions during signal transmission.

Question 8

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It uses membrane proteins to move molecules down their concentration gradient.

Question 9

A cell is placed in a solution and neither swells nor shrinks. What can you conclude about the solution?

Accepted Answer

It is isotonic to the cell.

Question 10

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

Packaging and modifying proteins for secretion

Question 11

A patient is diagnosed with a genetic disorder that affects the structure of their integral membrane proteins. Which cellular process is most likely to be directly impaired?

Accepted Answer

Facilitated diffusion of ions

Question 12

Which of the following equations correctly represents the calculation of water potential ($$\Psi) in $$plant cells?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 13

Which of the following best explains why phospholipids form a bilayer in aqueous environments?

Accepted Answer

Their hydrophilic heads interact with water, while their hydrophobic tails avoid water.

Question 14

A nerve impulse travels along a neuron due to the movement of ions. Which process restores the resting membrane potential after an action potential?

Accepted Answer

Active transport of sodium and potassium ions by the sodium-potassium pump

Question 15

Which of the following is NOT a function of membrane-bound organelles?

Accepted Answer

Facilitating the movement of water across the plasma membrane

Question 16

A student observes that a plant cell placed in distilled water becomes turgid. Which of the following best explains this observation?

Accepted Answer

Water moves into the cell by osmosis due to a higher solute concentration inside the cell.

Question 17

Which of the following best describes the role of synaptic vesicles in neurons?

Accepted Answer

They store and release neurotransmitters at the synapse.

Question 18

Which of the following is a correct statement about passive transport?

Accepted Answer

It includes diffusion and osmosis.

Question 19

A cell is observed to engulf large particles by wrapping its membrane around them and forming a vesicle. Which process is being described?

Accepted Answer

Endocytosis

Question 20

Which of the following best explains why the sodium-potassium pump is essential for nerve function?

Accepted Answer

It maintains the electrochemical gradient necessary for action potentials.

Cell Processes: Membrane Structure, Function, and Related Organelles

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